arrays

问题 From the MSDN: Parameters sourceArray The Array that contains the data to copy. destinationArray The Array that receives the data. length A 64-bit integer that represents the number of elements to copy. The integer must be between zero and Int32.MaxValue, inclusive Given that the permitted range of values is 0 to Int32.MaxValue , what is the motivation for adding this signature? It did not exist in .Net 1.0 and was only added in .Net 1.1. My only guess is to prepare for 64-bit Framework

问题 From the MSDN: Parameters sourceArray The Array that contains the data to copy. destinationArray The Array that receives the data. length A 64-bit integer that represents the number of elements to copy. The integer must be between zero and Int32.MaxValue, inclusive Given that the permitted range of values is 0 to Int32.MaxValue , what is the motivation for adding this signature? It did not exist in .Net 1.0 and was only added in .Net 1.1. My only guess is to prepare for 64-bit Framework

问题 I have this array that I need to convert to xml. array = [ { 'time': {"hour":"1", "minute":"30","seconds": "40"} }, { 'place': {"street":"40 something", "zip": "00000"} } ] The xml should have a title that I can put in as a variable for example, xml_title = "test" The result I want based on the array above and the xml title is this: <test> <time hour="1" minute="30" second="40"></time> <place> <street>40 something</street> <zip>00000</zip> </place> </test> I liked the answer given in a

问题 I have this array that I need to convert to xml. array = [ { 'time': {"hour":"1", "minute":"30","seconds": "40"} }, { 'place': {"street":"40 something", "zip": "00000"} } ] The xml should have a title that I can put in as a variable for example, xml_title = "test" The result I want based on the array above and the xml title is this: <test> <time hour="1" minute="30" second="40"></time> <place> <street>40 something</street> <zip>00000</zip> </place> </test> I liked the answer given in a

问题 In the class P below, the method test seems to return identically false : import java.util.function.IntPredicate; import java.util.stream.IntStream; public class P implements IntPredicate { private final static int SIZE = 33; @Override public boolean test(int seed) { int[] state = new int[SIZE]; state[0] = seed; for (int i = 1; i < SIZE; i++) { state[i] = state[i - 1]; } return seed != state[SIZE - 1]; } public static void main(String[] args) { long count = IntStream.range(0, 0x0010_0000)

问题 I found out that {:?} prints an entire array in Rust. I want to know what is it called and how exactly it works. Is it only limited to printing arrays or could it also be used elsewhere for other purposes? 回答1: This is explained (along with the rest of the formatting syntax) in the std::fmt documentation. {...} surrounds all formatting directives. : separates the name or ordinal of the thing being formatted (which in this case is omitted , and thus means "the next thing") from the formatting

问题 I found out that {:?} prints an entire array in Rust. I want to know what is it called and how exactly it works. Is it only limited to printing arrays or could it also be used elsewhere for other purposes? 回答1: This is explained (along with the rest of the formatting syntax) in the std::fmt documentation. {...} surrounds all formatting directives. : separates the name or ordinal of the thing being formatted (which in this case is omitted , and thus means "the next thing") from the formatting

问题 I'm working with VBA and need to save data in type key => value to getting fastest; This data type help me cache responese text from http request, increase query speed. But I don't know what is the best way to do it? I need a data type same as php array with key=>value ! Thank for help! 回答1: Have you looked at dictionary object? It's available as part of the Microsoft Scripting Runtime. A clear example of how to add this is given by this SO answer. Sub DictExample1() Dim dict As Dictionary

问题 I'm working with VBA and need to save data in type key => value to getting fastest; This data type help me cache responese text from http request, increase query speed. But I don't know what is the best way to do it? I need a data type same as php array with key=>value ! Thank for help! 回答1: Have you looked at dictionary object? It's available as part of the Microsoft Scripting Runtime. A clear example of how to add this is given by this SO answer. Sub DictExample1() Dim dict As Dictionary

问题 I know that the following is not correct: int arr[2][3] = {}; //some array initialization here int** ptr; ptr = arr; But I am quite surprised that the following lines actually work int arr[2][3] = {}; //some array initialization here auto ptr = arr; int another_arr[2][3] = {}; //some array initialization here ptr = another_arr; Can anyone possibly explain what is the type assigned to ptr in the second block of code, and what happened underneath? 回答1: Well, arrays decay to pointers when used